Buffett blasts bitcoin as 'mirage': 'Stay away!' By: CNBC.com News March 14, 2014 at 10:29 AM EDT Warren Buffett tells CNBC that bitcoins are like checks: They transmit money. "Are checks worth a whole lot of money just because they can transmit money?" Read More >> Related Stocks: Berkshire Hathaway Bitcoin (Bitstamp) Twitter, Inc.